Développement cross-plateforme sans compromis avec Xamarin
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Transcript of Développement cross-plateforme sans compromis avec Xamarin
#XamarinFR
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@micjames6
micjames.co.uk
Mike JamesDeveloper Evangelist, Xamarin Inc
Web
The best language for Windows development.
Modern Features • Advanced Tools • Proven Libraries • Large Community • Statically Typed
#
Xamarin makes C# the best language for mobile development.
Native Code Generation • Platform API Bindings • Code Sharing • Visual Studio
+#
Xamarin ‘embraced and extended’ .NET
Architecting
Mobile Apps
Silo
Approach
Build Apps
Multiple Times
Write Once,
Run Anywhere
Approach
Lowest
Common
Denominator
Xamarin’s Unique Approach
Native With
Code Sharing
Windows APIs
iOS APIs | 100% Coverage
Android APIs | 100% Coverage
Anything you can do in Objective-C, Swift, or Java
can be done in C# with Xamarin using Visual Studio
C# runs on 2.6 Billion Devices
How
Xamarin
Works
C# + .NET Runtime
Native UI
Native Performance
Portable Class Libraries
Xamarin.Forms
With Xamarin.Forms:
more code-sharing, native controlsTraditional Xamarin approach
Shared UI Code
Xamarin.Forms
Quickly and easily build native
user interfaces using shared code
Xamarin.Forms elements map to
native controls and behaviours
Mix-and-match Xamarin.Forms
with native APIs
Shared UI Code
What’s Included
40+ Pages, Layouts, and Controls
Build from code behind or XAML
Two-way Data Binding
Navigation
Animation API
Dependency Service
Messaging Center
Shared UI Code
Pages
Content MasterDetail Navigation Tabbed Carousel
Layouts
Stack Absolute Relative Grid ContentView ScrollView Frame
Controls
ActivityIndicator BoxView Button DatePicker Editor
Entry Image Label ListView Map
OpenGLView Picker ProgressBar SearchBar Slider
Stepper TableView TimePicker WebView EntryCell
ImageCell SwitchCell TextCell ViewCell
• Not for all types of apps
• Is your app very customised?
• Great for data driven apps
• Utility apps
• Also supports maps
Considerations
24
Platform-specific
projects act as
"host" to create
native application
Portable Class Library or
Shared Project used to
hold shared code that
defines UI and logic
Project Structure
Pages
• Single screen of content
• ContentPage holds one visual element
ContentPage
Control
Content property
Layouts
• Layouts handle child elements
• Layouts come in two types: managed and unmanaged
ContentPage
Layout
Content property
Control
Control
Children
Control
Demo - Creating User Interfaces
28
Providing Behaviour
var entry = new Entry
{
Placeholder = "Enter text",
Keyboard = Keyboard.Email
};
entry.TextChanged += (sender, e) => {
// Input changed
};
Controls expose properties to alter visualisation
Controls expose events to provide interactive behaviour
Demo - Adding Behaviour
30
Model-View-ViewModel
ModelView ViewModel
How to display
information
What to display
Flow of interaction
Business Logic
Data objects
Events
DataData
31
Model-View-ViewModel
ModelView ViewModel
Xamarin.Forms Data
Binding
Events
Data
32
Data Binding
33
Data Binding
34
Data Binding
35
Data Binding
Demo - Stocks
38
Extensibility
• Custom Renderer• Easily subclass any control you wish to customize
• Add your own custom controls• Add custom bindable properties
http://developer.xamarin.com/guides/cross-
platform/xamarin-forms/custom-renderer/
39
Extensibility
Standard Entry Control
40
Extensibility
Step 1: Custom Xamarin.Forms Control
41
Extensibility
Step 2: Use Custom Control in Shared Pages
42
Extensibility
Step 3: Implement Custom Renderer
43
Extensibility
Step 4: Export Renderer
44
Extensibility
Dependency ServiceAllows shared code to access platform-specific SDK features via an Interface
Implementation
45
Summary
• Cross platform apps the easy way
• Powerful layout functionality
• Many built in controls
• Extensible
46
Charles Petzold
Xamarin
Read the book
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in your time-zone, on your schedule and as often as you'd like
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